public class Pillar1{
	Geometry bottom;
	double height;
	Pillar1 (Geometry bottom,double height){
		this.bottom=bottom;this.height=height;
	}
	public double getVolume(){
		if (bottom==null){
			System.out.println("没有底，无法计算体积");
			return -1;
		}
	return bottom.getArea()*height;
	}
}
	
